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   1 /*
   2  * rev-parse.c
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "commit.h"
   8 #include "refs.h"
   9 #include "quote.h"
  10 #include "builtin.h"
  11 #include "parse-options.h"
  12
  13 #define DO_REVS         1
  14 #define DO_NOREV        2
  15 #define DO_FLAGS        4
  16 #define DO_NONFLAGS     8
  17 static int filter = ~0;
  18
  19 static const char *def;
  20
  21 #define NORMAL 0
  22 #define REVERSED 1
  23 static int show_type = NORMAL;
  24
  25 #define SHOW_SYMBOLIC_ASIS 1
  26 #define SHOW_SYMBOLIC_FULL 2
  27 static int symbolic;
  28 static int abbrev;
  29 static int abbrev_ref;
  30 static int abbrev_ref_strict;
  31 static int output_sq;
  32
  33 /*
  34  * Some arguments are relevant "revision" arguments,
  35  * others are about output format or other details.
  36  * This sorts it all out.
  37  */
  38 static int is_rev_argument(const char *arg)
  39 {
  40         static const char *rev_args[] = {
  41                 "--all",
  42                 "--bisect",
  43                 "--dense",
  44                 "--branches=",
  45                 "--branches",
  46                 "--header",
  47                 "--ignore-missing",
  48                 "--max-age=",
  49                 "--max-count=",
  50                 "--min-age=",
  51                 "--no-merges",
  52                 "--min-parents=",
  53                 "--no-min-parents",
  54                 "--max-parents=",
  55                 "--no-max-parents",
  56                 "--objects",
  57                 "--objects-edge",
  58                 "--parents",
  59                 "--pretty",
  60                 "--remotes=",
  61                 "--remotes",
  62                 "--glob=",
  63                 "--sparse",
  64                 "--tags=",
  65                 "--tags",
  66                 "--topo-order",
  67                 "--date-order",
  68                 "--unpacked",
  69                 NULL
  70         };
  71         const char **p = rev_args;
  72
  73         /* accept -<digit>, like traditional "head" */
  74         if ((*arg == '-') && isdigit(arg[1]))
  75                 return 1;
  76
  77         for (;;) {
  78                 const char *str = *p++;
  79                 int len;
  80                 if (!str)
  81                         return 0;
  82                 len = strlen(str);
  83                 if (!strcmp(arg, str) ||
  84                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  85                         return 1;
  86         }
  87 }
  88
  89 /* Output argument as a string, either SQ or normal */
  90 static void show(const char *arg)
  91 {
  92         if (output_sq) {
  93                 int sq = '\'', ch;
  94
  95                 putchar(sq);
  96                 while ((ch = *arg++)) {
  97                         if (ch == sq)
  98                                 fputs("'\\'", stdout);
  99                         putchar(ch);
 100                 }
 101                 putchar(sq);
 102                 putchar(' ');
 103         }
 104         else
 105                 puts(arg);
 106 }
 107
 108 /* Like show(), but with a negation prefix according to type */
 109 static void show_with_type(int type, const char *arg)
 110 {
 111         if (type != show_type)
 112                 putchar('^');
 113         show(arg);
 114 }
 115
 116 /* Output a revision, only if filter allows it */
 117 static void show_rev(int type, const unsigned char *sha1, const char *name)
 118 {
 119         if (!(filter & DO_REVS))
 120                 return;
 121         def = NULL;
 122
 123         if ((symbolic || abbrev_ref) && name) {
 124                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 125                         unsigned char discard[20];
 126                         char *full;
 127
 128                         switch (dwim_ref(name, strlen(name), discard, &full)) {
 129                         case 0:
 130                                 /*
 131                                  * Not found -- not a ref.  We could
 132                                  * emit "name" here, but symbolic-full
 133                                  * users are interested in finding the
 134                                  * refs spelled in full, and they would
 135                                  * need to filter non-refs if we did so.
 136                                  */
 137                                 break;
 138                         case 1: /* happy */
 139                                 if (abbrev_ref)
 140                                         full = shorten_unambiguous_ref(full,
 141                                                 abbrev_ref_strict);
 142                                 show_with_type(type, full);
 143                                 break;
 144                         default: /* ambiguous */
 145                                 error("refname '%s' is ambiguous", name);
 146                                 break;
 147                         }
 148                 } else {
 149                         show_with_type(type, name);
 150                 }
 151         }
 152         else if (abbrev)
 153                 show_with_type(type, find_unique_abbrev(sha1, abbrev));
 154         else
 155                 show_with_type(type, sha1_to_hex(sha1));
 156 }
 157
 158 /* Output a flag, only if filter allows it. */
 159 static int show_flag(const char *arg)
 160 {
 161         if (!(filter & DO_FLAGS))
 162                 return 0;
 163         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 164                 show(arg);
 165                 return 1;
 166         }
 167         return 0;
 168 }
 169
 170 static int show_default(void)
 171 {
 172         const char *s = def;
 173
 174         if (s) {
 175                 unsigned char sha1[20];
 176
 177                 def = NULL;
 178                 if (!get_sha1(s, sha1)) {
 179                         show_rev(NORMAL, sha1, s);
 180                         return 1;
 181                 }
 182         }
 183         return 0;
 184 }
 185
 186 static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 187 {
 188         show_rev(NORMAL, sha1, refname);
 189         return 0;
 190 }
 191
 192 static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 193 {
 194         show_rev(REVERSED, sha1, refname);
 195         return 0;
 196 }
 197
 198 static int show_abbrev(const unsigned char *sha1, void *cb_data)
 199 {
 200         show_rev(NORMAL, sha1, NULL);
 201         return 0;
 202 }
 203
 204 static void show_datestring(const char *flag, const char *datestr)
 205 {
 206         static char buffer[100];
 207
 208         /* date handling requires both flags and revs */
 209         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 210                 return;
 211         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 212         show(buffer);
 213 }
 214
 215 static int show_file(const char *arg)
 216 {
 217         show_default();
 218         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 219                 show(arg);
 220                 return 1;
 221         }
 222         return 0;
 223 }
 224
 225 static int try_difference(const char *arg)
 226 {
 227         char *dotdot;
 228         unsigned char sha1[20];
 229         unsigned char end[20];
 230         const char *next;
 231         const char *this;
 232         int symmetric;
 233
 234         if (!(dotdot = strstr(arg, "..")))
 235                 return 0;
 236         next = dotdot + 2;
 237         this = arg;
 238         symmetric = (*next == '.');
 239
 240         *dotdot = 0;
 241         next += symmetric;
 242
 243         if (!*next)
 244                 next = "HEAD";
 245         if (dotdot == arg)
 246                 this = "HEAD";
 247         if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 248                 show_rev(NORMAL, end, next);
 249                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 250                 if (symmetric) {
 251                         struct commit_list *exclude;
 252                         struct commit *a, *b;
 253                         a = lookup_commit_reference(sha1);
 254                         b = lookup_commit_reference(end);
 255                         exclude = get_merge_bases(a, b, 1);
 256                         while (exclude) {
 257                                 struct commit_list *n = exclude->next;
 258                                 show_rev(REVERSED,
 259                                          exclude->item->object.sha1,NULL);
 260                                 free(exclude);
 261                                 exclude = n;
 262                         }
 263                 }
 264                 return 1;
 265         }
 266         *dotdot = '.';
 267         return 0;
 268 }
 269
 270 static int try_parent_shorthands(const char *arg)
 271 {
 272         char *dotdot;
 273         unsigned char sha1[20];
 274         struct commit *commit;
 275         struct commit_list *parents;
 276         int parents_only;
 277
 278         if ((dotdot = strstr(arg, "^!")))
 279                 parents_only = 0;
 280         else if ((dotdot = strstr(arg, "^@")))
 281                 parents_only = 1;
 282
 283         if (!dotdot || dotdot[2])
 284                 return 0;
 285
 286         *dotdot = 0;
 287         if (get_sha1_committish(arg, sha1))
 288                 return 0;
 289
 290         if (!parents_only)
 291                 show_rev(NORMAL, sha1, arg);
 292         commit = lookup_commit_reference(sha1);
 293         for (parents = commit->parents; parents; parents = parents->next)
 294                 show_rev(parents_only ? NORMAL : REVERSED,
 295                                 parents->item->object.sha1, arg);
 296
 297         return 1;
 298 }
 299
 300 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 301 {
 302         struct strbuf *parsed = o->value;
 303         if (unset)
 304                 strbuf_addf(parsed, " --no-%s", o->long_name);
 305         else if (o->short_name)
 306                 strbuf_addf(parsed, " -%c", o->short_name);
 307         else
 308                 strbuf_addf(parsed, " --%s", o->long_name);
 309         if (arg) {
 310                 strbuf_addch(parsed, ' ');
 311                 sq_quote_buf(parsed, arg);
 312         }
 313         return 0;
 314 }
 315
 316 static const char *skipspaces(const char *s)
 317 {
 318         while (isspace(*s))
 319                 s++;
 320         return s;
 321 }
 322
 323 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 324 {
 325         static int keep_dashdash = 0, stop_at_non_option = 0;
 326         static char const * const parseopt_usage[] = {
 327                 "git rev-parse --parseopt [options] -- [<args>...]",
 328                 NULL
 329         };
 330         static struct option parseopt_opts[] = {
 331                 OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 332                                         "keep the `--` passed as an arg"),
 333                 OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 334                                         "stop parsing after the "
 335                                         "first non-option argument"),
 336                 OPT_END(),
 337         };
 338
 339         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 340         const char **usage = NULL;
 341         struct option *opts = NULL;
 342         int onb = 0, osz = 0, unb = 0, usz = 0;
 343
 344         strbuf_addstr(&parsed, "set --");
 345         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 346                              PARSE_OPT_KEEP_DASHDASH);
 347         if (argc < 1 || strcmp(argv[0], "--"))
 348                 usage_with_options(parseopt_usage, parseopt_opts);
 349
 350         /* get the usage up to the first line with a -- on it */
 351         for (;;) {
 352                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
 353                         die("premature end of input");
 354                 ALLOC_GROW(usage, unb + 1, usz);
 355                 if (!strcmp("--", sb.buf)) {
 356                         if (unb < 1)
 357                                 die("no usage string given before the `--' separator");
 358                         usage[unb] = NULL;
 359                         break;
 360                 }
 361                 usage[unb++] = strbuf_detach(&sb, NULL);
 362         }
 363
 364         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 365         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 366                 const char *s;
 367                 struct option *o;
 368
 369                 if (!sb.len)
 370                         continue;
 371
 372                 ALLOC_GROW(opts, onb + 1, osz);
 373                 memset(opts + onb, 0, sizeof(opts[onb]));
 374
 375                 o = &opts[onb++];
 376                 s = strchr(sb.buf, ' ');
 377                 if (!s || *sb.buf == ' ') {
 378                         o->type = OPTION_GROUP;
 379                         o->help = xstrdup(skipspaces(sb.buf));
 380                         continue;
 381                 }
 382
 383                 o->type = OPTION_CALLBACK;
 384                 o->help = xstrdup(skipspaces(s));
 385                 o->value = &parsed;
 386                 o->flags = PARSE_OPT_NOARG;
 387                 o->callback = &parseopt_dump;
 388                 while (s > sb.buf && strchr("*=?!", s[-1])) {
 389                         switch (*--s) {
 390                         case '=':
 391                                 o->flags &= ~PARSE_OPT_NOARG;
 392                                 break;
 393                         case '?':
 394                                 o->flags &= ~PARSE_OPT_NOARG;
 395                                 o->flags |= PARSE_OPT_OPTARG;
 396                                 break;
 397                         case '!':
 398                                 o->flags |= PARSE_OPT_NONEG;
 399                                 break;
 400                         case '*':
 401                                 o->flags |= PARSE_OPT_HIDDEN;
 402                                 break;
 403                         }
 404                 }
 405
 406                 if (s - sb.buf == 1) /* short option only */
 407                         o->short_name = *sb.buf;
 408                 else if (sb.buf[1] != ',') /* long option only */
 409                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 410                 else {
 411                         o->short_name = *sb.buf;
 412                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 413                 }
 414         }
 415         strbuf_release(&sb);
 416
 417         /* put an OPT_END() */
 418         ALLOC_GROW(opts, onb + 1, osz);
 419         memset(opts + onb, 0, sizeof(opts[onb]));
 420         argc = parse_options(argc, argv, prefix, opts, usage,
 421                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 422                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 423                         PARSE_OPT_SHELL_EVAL);
 424
 425         strbuf_addf(&parsed, " --");
 426         sq_quote_argv(&parsed, argv, 0);
 427         puts(parsed.buf);
 428         return 0;
 429 }
 430
 431 static int cmd_sq_quote(int argc, const char **argv)
 432 {
 433         struct strbuf buf = STRBUF_INIT;
 434
 435         if (argc)
 436                 sq_quote_argv(&buf, argv, 0);
 437         printf("%s\n", buf.buf);
 438         strbuf_release(&buf);
 439
 440         return 0;
 441 }
 442
 443 static void die_no_single_rev(int quiet)
 444 {
 445         if (quiet)
 446                 exit(1);
 447         else
 448                 die("Needed a single revision");
 449 }
 450
 451 static const char builtin_rev_parse_usage[] =
 452 "git rev-parse --parseopt [options] -- [<args>...]\n"
 453 "   or: git rev-parse --sq-quote [<arg>...]\n"
 454 "   or: git rev-parse [options] [<arg>...]\n"
 455 "\n"
 456 "Run \"git rev-parse --parseopt -h\" for more information on the first usage.";
 457
 458 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 459 {
 460         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 461         unsigned char sha1[20];
 462         const char *name = NULL;
 463
 464         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 465                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 466
 467         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 468                 return cmd_sq_quote(argc - 2, argv + 2);
 469
 470         if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
 471                 int i;
 472                 for (i = 0; local_repo_env[i]; i++)
 473                         printf("%s\n", local_repo_env[i]);
 474                 return 0;
 475         }
 476
 477         if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
 478                 const char *gitdir = resolve_gitdir(argv[2]);
 479                 if (!gitdir)
 480                         die("not a gitdir '%s'", argv[2]);
 481                 puts(gitdir);
 482                 return 0;
 483         }
 484
 485         if (argc > 1 && !strcmp("-h", argv[1]))
 486                 usage(builtin_rev_parse_usage);
 487
 488         prefix = setup_git_directory();
 489         git_config(git_default_config, NULL);
 490         for (i = 1; i < argc; i++) {
 491                 const char *arg = argv[i];
 492
 493                 if (as_is) {
 494                         if (show_file(arg) && as_is < 2)
 495                                 verify_filename(prefix, arg, 0);
 496                         continue;
 497                 }
 498                 if (!strcmp(arg,"-n")) {
 499                         if (++i >= argc)
 500                                 die("-n requires an argument");
 501                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 502                                 show(arg);
 503                                 show(argv[i]);
 504                         }
 505                         continue;
 506                 }
 507                 if (!prefixcmp(arg, "-n")) {
 508                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 509                                 show(arg);
 510                         continue;
 511                 }
 512
 513                 if (*arg == '-') {
 514                         if (!strcmp(arg, "--")) {
 515                                 as_is = 2;
 516                                 /* Pass on the "--" if we show anything but files.. */
 517                                 if (filter & (DO_FLAGS | DO_REVS))
 518                                         show_file(arg);
 519                                 continue;
 520                         }
 521                         if (!strcmp(arg, "--default")) {
 522                                 def = argv[i+1];
 523                                 i++;
 524                                 continue;
 525                         }
 526                         if (!strcmp(arg, "--revs-only")) {
 527                                 filter &= ~DO_NOREV;
 528                                 continue;
 529                         }
 530                         if (!strcmp(arg, "--no-revs")) {
 531                                 filter &= ~DO_REVS;
 532                                 continue;
 533                         }
 534                         if (!strcmp(arg, "--flags")) {
 535                                 filter &= ~DO_NONFLAGS;
 536                                 continue;
 537                         }
 538                         if (!strcmp(arg, "--no-flags")) {
 539                                 filter &= ~DO_FLAGS;
 540                                 continue;
 541                         }
 542                         if (!strcmp(arg, "--verify")) {
 543                                 filter &= ~(DO_FLAGS|DO_NOREV);
 544                                 verify = 1;
 545                                 continue;
 546                         }
 547                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 548                                 quiet = 1;
 549                                 continue;
 550                         }
 551                         if (!strcmp(arg, "--short") ||
 552                             !prefixcmp(arg, "--short=")) {
 553                                 filter &= ~(DO_FLAGS|DO_NOREV);
 554                                 verify = 1;
 555                                 abbrev = DEFAULT_ABBREV;
 556                                 if (arg[7] == '=')
 557                                         abbrev = strtoul(arg + 8, NULL, 10);
 558                                 if (abbrev < MINIMUM_ABBREV)
 559                                         abbrev = MINIMUM_ABBREV;
 560                                 else if (40 <= abbrev)
 561                                         abbrev = 40;
 562                                 continue;
 563                         }
 564                         if (!strcmp(arg, "--sq")) {
 565                                 output_sq = 1;
 566                                 continue;
 567                         }
 568                         if (!strcmp(arg, "--not")) {
 569                                 show_type ^= REVERSED;
 570                                 continue;
 571                         }
 572                         if (!strcmp(arg, "--symbolic")) {
 573                                 symbolic = SHOW_SYMBOLIC_ASIS;
 574                                 continue;
 575                         }
 576                         if (!strcmp(arg, "--symbolic-full-name")) {
 577                                 symbolic = SHOW_SYMBOLIC_FULL;
 578                                 continue;
 579                         }
 580                         if (!prefixcmp(arg, "--abbrev-ref") &&
 581                             (!arg[12] || arg[12] == '=')) {
 582                                 abbrev_ref = 1;
 583                                 abbrev_ref_strict = warn_ambiguous_refs;
 584                                 if (arg[12] == '=') {
 585                                         if (!strcmp(arg + 13, "strict"))
 586                                                 abbrev_ref_strict = 1;
 587                                         else if (!strcmp(arg + 13, "loose"))
 588                                                 abbrev_ref_strict = 0;
 589                                         else
 590                                                 die("unknown mode for %s", arg);
 591                                 }
 592                                 continue;
 593                         }
 594                         if (!strcmp(arg, "--all")) {
 595                                 for_each_ref(show_reference, NULL);
 596                                 continue;
 597                         }
 598                         if (!prefixcmp(arg, "--disambiguate=")) {
 599                                 for_each_abbrev(arg + 15, show_abbrev, NULL);
 600                                 continue;
 601                         }
 602                         if (!strcmp(arg, "--bisect")) {
 603                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 604                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 605                                 continue;
 606                         }
 607                         if (!prefixcmp(arg, "--branches=")) {
 608                                 for_each_glob_ref_in(show_reference, arg + 11,
 609                                         "refs/heads/", NULL);
 610                                 continue;
 611                         }
 612                         if (!strcmp(arg, "--branches")) {
 613                                 for_each_branch_ref(show_reference, NULL);
 614                                 continue;
 615                         }
 616                         if (!prefixcmp(arg, "--tags=")) {
 617                                 for_each_glob_ref_in(show_reference, arg + 7,
 618                                         "refs/tags/", NULL);
 619                                 continue;
 620                         }
 621                         if (!strcmp(arg, "--tags")) {
 622                                 for_each_tag_ref(show_reference, NULL);
 623                                 continue;
 624                         }
 625                         if (!prefixcmp(arg, "--glob=")) {
 626                                 for_each_glob_ref(show_reference, arg + 7, NULL);
 627                                 continue;
 628                         }
 629                         if (!prefixcmp(arg, "--remotes=")) {
 630                                 for_each_glob_ref_in(show_reference, arg + 10,
 631                                         "refs/remotes/", NULL);
 632                                 continue;
 633                         }
 634                         if (!strcmp(arg, "--remotes")) {
 635                                 for_each_remote_ref(show_reference, NULL);
 636                                 continue;
 637                         }
 638                         if (!strcmp(arg, "--show-toplevel")) {
 639                                 const char *work_tree = get_git_work_tree();
 640                                 if (work_tree)
 641                                         puts(work_tree);
 642                                 continue;
 643                         }
 644                         if (!strcmp(arg, "--show-prefix")) {
 645                                 if (prefix)
 646                                         puts(prefix);
 647                                 else
 648                                         putchar('\n');
 649                                 continue;
 650                         }
 651                         if (!strcmp(arg, "--show-cdup")) {
 652                                 const char *pfx = prefix;
 653                                 if (!is_inside_work_tree()) {
 654                                         const char *work_tree =
 655                                                 get_git_work_tree();
 656                                         if (work_tree)
 657                                                 printf("%s\n", work_tree);
 658                                         continue;
 659                                 }
 660                                 while (pfx) {
 661                                         pfx = strchr(pfx, '/');
 662                                         if (pfx) {
 663                                                 pfx++;
 664                                                 printf("../");
 665                                         }
 666                                 }
 667                                 putchar('\n');
 668                                 continue;
 669                         }
 670                         if (!strcmp(arg, "--git-dir")) {
 671                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 672                                 static char cwd[PATH_MAX];
 673                                 int len;
 674                                 if (gitdir) {
 675                                         puts(gitdir);
 676                                         continue;
 677                                 }
 678                                 if (!prefix) {
 679                                         puts(".git");
 680                                         continue;
 681                                 }
 682                                 if (!getcwd(cwd, PATH_MAX))
 683                                         die_errno("unable to get current working directory");
 684                                 len = strlen(cwd);
 685                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 686                                 continue;
 687                         }
 688                         if (!strcmp(arg, "--is-inside-git-dir")) {
 689                                 printf("%s\n", is_inside_git_dir() ? "true"
 690                                                 : "false");
 691                                 continue;
 692                         }
 693                         if (!strcmp(arg, "--is-inside-work-tree")) {
 694                                 printf("%s\n", is_inside_work_tree() ? "true"
 695                                                 : "false");
 696                                 continue;
 697                         }
 698                         if (!strcmp(arg, "--is-bare-repository")) {
 699                                 printf("%s\n", is_bare_repository() ? "true"
 700                                                 : "false");
 701                                 continue;
 702                         }
 703                         if (!prefixcmp(arg, "--since=")) {
 704                                 show_datestring("--max-age=", arg+8);
 705                                 continue;
 706                         }
 707                         if (!prefixcmp(arg, "--after=")) {
 708                                 show_datestring("--max-age=", arg+8);
 709                                 continue;
 710                         }
 711                         if (!prefixcmp(arg, "--before=")) {
 712                                 show_datestring("--min-age=", arg+9);
 713                                 continue;
 714                         }
 715                         if (!prefixcmp(arg, "--until=")) {
 716                                 show_datestring("--min-age=", arg+8);
 717                                 continue;
 718                         }
 719                         if (show_flag(arg) && verify)
 720                                 die_no_single_rev(quiet);
 721                         continue;
 722                 }
 723
 724                 /* Not a flag argument */
 725                 if (try_difference(arg))
 726                         continue;
 727                 if (try_parent_shorthands(arg))
 728                         continue;
 729                 name = arg;
 730                 type = NORMAL;
 731                 if (*arg == '^') {
 732                         name++;
 733                         type = REVERSED;
 734                 }
 735                 if (!get_sha1(name, sha1)) {
 736                         if (verify)
 737                                 revs_count++;
 738                         else
 739                                 show_rev(type, sha1, name);
 740                         continue;
 741                 }
 742                 if (verify)
 743                         die_no_single_rev(quiet);
 744                 as_is = 1;
 745                 if (!show_file(arg))
 746                         continue;
 747                 verify_filename(prefix, arg, 1);
 748         }
 749         if (verify) {
 750                 if (revs_count == 1) {
 751                         show_rev(type, sha1, name);
 752                         return 0;
 753                 } else if (revs_count == 0 && show_default())
 754                         return 0;
 755                 die_no_single_rev(quiet);
 756         } else
 757                 show_default();
 758         return 0;
 759 }